1,721,024 research outputs found
Composite biomaterials from fibre wastes: Characterization of wool-cellulose acetate blends
No full textHistological components from wool fibre wastes were extracted by an enzyme-ultrasonic treatment, characterised by SDS-PAGE and successively included, in different proportions, in a cellulose acetate matrix to make composite film-forming blends, suitable for film casting and filament spinning. Chemical, thermal and mechanical properties were characterised by FT-IR spectroscopy, DSC, TGA and tensile tests; surface and internal morphology were investigated by SEM and light microscopy. Cortical cells were partially degraded during extraction from wool, but the degradation extent does not depend on the enzyme amount used which, instead, showed an influence on the yield of the cell production. Cellulose acetate-wool cell blends are capable of forming smooth translucent composite films with acceptable tensile, thermal and water absorption properties. Extrusion in the form of filament resulted in a general orientation of the cortical cells in the direction of the fibre axis.
Application for keratin-cellulose based bio-composite materials can be envisaged as compostable packaging, disposables, agricultural films, textile fibres with novel properties such as improved fire resistance, moisture regain, dyeing performances, and colour effects, handle and look
L’avifauna della ZPS “Beigua-Turchino (Appennino Ligure – SV-GE): considerazioni biogeografiche
No full textNuovi dati sulla nidificazione dell’Airone cenerino, Ardea cinerea, in Valle Stura (Genova).
No full textRecupero e valorizzazione degli scarti di lana: caratterizzazione di membrane di acetato di cellulosa e cellule corticali
No full textChemical synthesis and deposition of conducting polypyrrole on textile materials
No full textSeveral methods have been proposed to improve the electrical properties of textiles made of fibres with poor electrical conductivity because of the large number of potential applications that can be successfully developed with conducting textiles in the technical fields (e.g. protective clothing, automotive fabrics, building covering). Polypyrrole (PPy) deposition seems one of the most promising way to coat fibres with a light and flexible conducting layer. The deposition process has been carried out by in situ chemical oxidative polymerisation of pyrrole (Py) in water. Suitable oxidising agents are ammonium persulfate (APS) or ferric chloride (FC)
Study of Methylene Blue adsorption on keratin nanofibrous membranes
No full text: In this work, keratin nanofibrous membranes (mean diameter of about 220nm) were prepared by electrospinning and tested as adsorbents for Methylene Blue through batch adsorption tests. The adsorption capacity of the membranes was evaluated as a function of initial dye concentration, pH, adsorbent dosage, time and temperature. The adsorption capacity increased with increasing the initial dye concentration and pH, while it decreased with increasing the adsorbent dosage and temperature, indicating an exothermic process. The adsorption results indicated that the Langmuir isotherm fitted the experimental data better than the Freundlich and Temkin isotherm models. A mean free energy evaluated through the Dubinin-Radushkevich model of about 16kJmol(-1), indicated a chemisorption process which occurred by ion exchange. The kinetic data were found to fit the pseudo-second-order model better than the pseudo-first-order model. The obtained results suggest that keratin nanofibrous membranes could be promising candidates as dye adsorption filters
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